Move forwardInputEvent from RenderFrame to RenderFrameProxy.

Depends on https://codereview.chromium.org/642203002.

BUG=346764
TEST=Input events work in OOPIFs with --site-per-process.

Review URL: https://codereview.chromium.org/647653002

Cr-Commit-Position: refs/heads/master@{#299196}

content/renderer/render_frame_impl.cc

@@ -3161,10 +3161,6 @@ void RenderFrameImpl::didLoseWebGLContext(blink::WebLocalFrame* frame,
       arb_robustness_status_code));
 }
 
-void RenderFrameImpl::forwardInputEvent(const blink::WebInputEvent* event) {
-  Send(new FrameHostMsg_ForwardInputEvent(routing_id_, event));
-}
-
 blink::WebScreenOrientationClient*
     RenderFrameImpl::webScreenOrientationClient() {
   if (!screen_orientation_dispatcher_)

content/renderer/render_frame_impl.h

@@ -41,7 +41,6 @@ struct FrameMsg_CommitNavigation_Params;
 
 namespace blink {
 class WebGeolocationClient;
-class WebInputEvent;
 class WebMouseEvent;
 class WebContentDecryptionModule;
 class WebMediaPlayer;
@@ -450,7 +449,6 @@ class CONTENT_EXPORT RenderFrameImpl
   virtual bool allowWebGL(blink::WebLocalFrame* frame, bool default_value);
   virtual void didLoseWebGLContext(blink::WebLocalFrame* frame,
                                    int arb_robustness_status_code);
-  virtual void forwardInputEvent(const blink::WebInputEvent* event);
   virtual blink::WebScreenOrientationClient* webScreenOrientationClient();
   virtual bool isControlledByServiceWorker(blink::WebDataSource&);
   virtual void postAccessibilityEvent(const blink::WebAXObject& obj,

content/renderer/render_frame_proxy.cc

@@ -294,4 +294,8 @@ void RenderFrameProxy::navigate(const blink::WebURLRequest& request,
   Send(new FrameHostMsg_OpenURL(routing_id_, params));
 }
 
+void RenderFrameProxy::forwardInputEvent(const blink::WebInputEvent* event) {
+  Send(new FrameHostMsg_ForwardInputEvent(routing_id_, event));
+}
+
 }  // namespace

content/renderer/render_frame_proxy.h

@@ -17,6 +17,10 @@
 struct FrameMsg_BuffersSwapped_Params;
 struct FrameMsg_CompositorFrameSwapped_Params;
 
+namespace blink {
+class WebInputEvent;
+}
+
 namespace content {
 
 class ChildFrameCompositingHelper;
@@ -104,6 +108,7 @@ class CONTENT_EXPORT RenderFrameProxy
       float scale_factor);
   virtual void navigate(const blink::WebURLRequest& request,
                         bool should_replace_current_entry);
+  virtual void forwardInputEvent(const blink::WebInputEvent* event);
 
  private:
   RenderFrameProxy(int routing_id, int frame_routing_id);